Sifter.



PATBNTED OCT. 11, 1904.

J. H. lKOLKMMHQ.

SIPTER.

ABPLIGATIQN' FILED rma. 19, 1904.

2 SHEETS-SHEBT'L N0 MODEL.

m, m n ,ZM K E n M vNo. 771,876.. PATENTBD 00T. 11,1904.

APPLIOATION FILED FEB. 19, 1904.

No MODEL. v 2 xmms-SHEET 2;

Pim/

Patented October 11, 1904.

PATENT OEEICE.

JOHN H. KOLKMANN, OF NEW YORK, N. Y.

SIFTER.

SPECIFICATION forming part of Letters Patent No. 771,876, dated October 11, 1904. Application iled February 19, 1904. Serial No. 194,353. (No model.)

' To all whom it may concern:

Be it known that I, JOHN H. KOLKMANN, a citizen of the United States, residing at New York, in the county of New York and State of New York, haveyinvented certain new and useful Improvements in Sifters, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to sifters; and the object thereof is to provide an improved device of this class designed for use in sifting ores, ashes, and the like, but which may be used wherever devices of this class are required; and with this and other objects in View the invention consists in a sifter constructed as hereinafter described and claimed.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts of my improvement are designated by suitable reference characters in each'of the views, and in which- Figure 1 is an end view of my improved sifter looking in the direction of the arrow of Fig. 2; Fig. 2, a side view thereof; Fig. 3, a side view of a central shaft 'whichforms a part of my improved sifter and around which the body portion of the sifter is formed; Fig. 4, a side view of a bar which constitutes a part of the body portion of the sifter, as hereinafter described; Fig.5, a side view of an arm, a number of which are in practice mounted on the shaft shown inFig. 3; Fig. 6, a View of the arm shown in Fig. 5 and at rig'ht angles thereto, andFig. 7 a detail View of one of the end bands or rings of the sifter.

In the practice of my invention as shown in the drawings I provide a frame or support comprising a base co, having upright end members a2, in the top of which my improved sifter b is mounted. The general form of the sifter bis that of a cylinder, one end of which is truncated, and the said sifter is of the following construction: Mounted between the upright supports a2 is a shaft c, which is shown in detail in Fig. 3 and which is provided with end journals c2,- one of which projects in the form of construction shown as indicated at the right-hand end of Fig. 2, thenobject of this being to provide means for turning the sifter. The shaft c is also provided with two spirally-arranged grooves c3, and said grooves extend from one end of said shaft to the other and each of said grooves passes once around said shaft. The shaft c is provided with a plurality of arms CZ, having a central circular portion d2, through which said shaft passes and the inner side walls of which are provided with oppositely-arranged lugs or projections d3, which are adapted to fit in and move in the grooves c3, and the arms Z are provided with regularly-arranged perforations or holes di, which are equally spaced, as shown in Figs. 5 and 6, and the length of the arms d fix the diameter of the sifter, as will hereinafter appear. Y

At the opposite ends of the sifter are rings or bands e and e2, a portion of one of which is shown in Fig. 7, and these rings or bands are exactly the same, except that the ring or band e2 at the truncated end of the sifter is smaller or of less diameter than the ring or band e at the opposite end. The rings or bands e and e2 are connected by parallel bars f, which are arranged closely adjacent, the spaces between these bars depending on the particular object for which the sifter is intended, and said bars I; are provided at the truncated end of the sifter with an inwardly-directed member f2, and each end of said bars is provided with a lug or projection f3, and these lugs or projections f3 are passed through the rings or bands e and e2, said rings or bands e and e2 being provided with holes @3 for this purpose, and the said lugs or projections f3 are provided in the form of construction shown with small holes f4, and a wire or similar fastening device f5 is passed through these holes f4 at each end of the sifter and securely binds the rings or bands e and e2 and the bars f together. The bars f are also provided with perforations or holes f equally spaced from one end of said bars to the other and through these holes f are passed spirally-arranged wires g, and the distance between thespirallyfarranged wires g, the ends of which are secured in any desired manner, will depend upon the particular object for which the sifter is intended, as hereinbefore stated with reference to the bars f.

In placing the arms CZ on the shaft c the lugs or projections (Z3 enter the grooves c, and said arms may be moved on said' shaft from one end to the other, and said arms are also placed comparatively close together on saidV shaft, and this method of mounting the said arms on said shaft produces a radial arrangement of said arms which extends from one of said shafts to the other and entirely around said shaft, one -half of this arrangement being shown in Fig. 2, the body of the sifter in said figure being broken, as shown at y. The arms CZ are also connected by spirally-arranged wires L, which are passed through all the perforations d* in said arms, and the ends of the arms d pass between the bars f or into the spaces between said bars, and the spirally-arranged wires g are passed through the ends of said arms, as clearly indicated at c', and thc interstices or spaces formed by the arms d and the wires L that are passed therethrough or the dimensions of said interstices or spaces will be regulated by the distance between the arms Z and the holes or perforations CZ* in said arms, and it will also be observed that the greater the number of the arms d employed the less will be the space between the parallel bars f, as the ends of the arms cl enter all the spaces between the said bars.

It will therefore be seen that my improved sifter comprises a cylindrical body portion composed of outer parallel bars connected by spirally-arranged wires, a central shaft having radial arms arranged spirally thereon and provided with perforations or holes throughout their lengths and through which are passed wires, said arms and wires forming on said shaft a spirally-arranged screen, which extends from one end of said shaft to the other, and the ends of said arms in the form of construction shown being connected with the parallel bars, which make up the outer body portion of the screws by means of the spirallyarranged wires which connect said b ars.

In the form of construction shown the grooves c" in the shaft c extend a little more than once around said shaft, and it will be apparent that the spirally-arranged screen formed on said shaft would also with this form of construction extend a little more than once around said shaft; but it will be apparent that the grooves c3 may extend spi* rally around said shaft any desired number of times or parts of times.

In practice the material to be sifted is fed into the larger end of the sifter through a spout 7c or in any desired manner, and said sifter is turned in any preferred way, and in this operation the material to be sifted passes gradually from the larger to the smaller end of said sifter. and all the finer particles pass through the sifter and will fall into any suitable receptacle prepared therefor, while the coarser particles will remain in the sifter and may be removed therefrom in any desired way. v

In the operation of turning the sifter the spirally-arranged screen connected with the shaft c keeps the contents of the sifter in constant movement, the said contents rising and falling as the sifter is turned and the shape and construction of the screen on the shaft c, formed by the arms Z and wires 7L, will gradually feed the contents of the sifter toward the truncated end thereof.

It will be apparent that many changes in and modifications of the construction herein described may be made without departing from the spirit of my invention or sacrificing its advantages, and I reserve the right to make all such alterations therein as fairly come within the scope of the invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, isd

1. A screen, comprising a central shaft, a plurality of arms radially and spirally arranged thereon and connected by spirally-arranged wires which are connected therewith throughout their lengths and a cylindrical body portion inclosing said shaft and said arms and comprising parallel bars connected at their ends and also connected by spirallyarranged wires, substantially as shown and described.

2. A screen, comprising a central shaft, a

plurality of arms radially and spirally ar-` ranged thereon and connected by spirally-arranged wires which are connected therewith throughout their lengths and a cylindrical body portion inclosing said shaft and said arms and comprising parallel bars connected at their ends and also connected by spirallyarranged wires which are also connected with the ends of said arms, substantially as shown and described.

3. A screen, comprising a central shaft, a

plurality of arms radially. and spirally arranged thereon and connected by spirally-arranged wires which are connected therewith throughout their lengths and a cylindrical body portion inclosing said shaft and said arms and comprising parallel bars connected at their ends and also connected by spirallyarranged wires which are also connected with the ends of said arms, one end of said screen being also truncated in form, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 18th day of February, 1904.

JOHN H. KOLKMANN.

Witnesses:

F. A. STEWART, C. J. KLEIN.

IOO 

